**Question 1:**
Write as a percentage $1\frac{2}{5}$

**Question 2:**
Find a number if $4\%$
of that number is $15$

**Question 3:**
In a park grows $300$
oaks. How many trees are in the park, if the oaks make up $25\%$
of all trees?

**Question 4:**
Find $8\%$
of $4km$

**Question 5:**
Cost of manufacturing parts at the factory is $680$
pounds. The introduction of new technologies has allowed to reduce the cost by $2\%$. What is the cost of manufacturing parts after changes?

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